Abstract: The present invention relates to a fuel cell group (10) for generating electrical energy, comprising a main fuel cell system (100) with at least one main fuel cell stack (120) and at least one auxiliary fuel cell system (200) with at least one auxiliary fuel cell stack (220), wherein the main fuel cell system (100) and the at least one auxiliary fuel cell system (200) are electrically connected in parallel, wherein the main fuel cell system (100) has a main control module (110) for variable control of a variable main operating point (HBP) and the auxiliary fuel cell system (200) has an auxiliary switching module (210) for switching between an off-state (AZ) and at least one specified on-state (EZ).

Abstract: The present invention relates to an inspection method for controlling an opening duration (OD) of an outlet valve (142) of a liquid container (140) in an anode exhaust gas section (124) of a fuel cell system (100), wherein the following steps are provided: opening the outlet valve (142) to drain liquid (F) from the liquid container (140), recording the anode pressure (AP) in the anode exhaust gas section (124) at the time of opening the outlet valve (142), setting an anode pressure reference value (APR) based on the recorded anode pressure (AP), further monitoring of the anode pressure (AP) during the opening duration (OD) of the outlet valve (142), determining an anode pressure deviation (APA) of the monitored anode pressure (AP) from the set anode pressure reference value (APR), closing the outlet valve (142) when the determined anode pressure deviation (APA) exceeds a deviation threshold (AG).

Abstract: The present invention relates to a test method for testing the disconnection function of a main switch device (110) of an electrical connection device (100) of a fuel cell system (200), the method having the following steps: generating a voltage variation (VV) on the low-voltage side (LVS) of a transformer device (120), switching a negative main switch (112) of the main switch device (110), detecting a voltage difference (VD) between a low voltage (LV) of the low-voltage side (LVS) of the transformer device (120) and a system voltage (SV) of the fuel cell system (200), comparing the voltage difference (VD) detected with a zero value (NW).

Abstract: The present invention relates to a test method for testing the disconnection function of a main switch device (110) of an electrical connection device (100) of a fuel cell system (200), the method having the following steps: generating a voltage variation (VV) on the low-voltage side (LVS) of a transformer device (120), switching a negative main switch (112) of the main switch device (110), detecting a voltage difference (VD) between a low voltage (LV) of the low-voltage side (LVS) of the transformer device (120) and a system voltage (SV) of the fuel cell system (200), comparing the voltage difference (VD) detected with a zero value (NW).